Which of the following lanthanoid ions is diamagnetic? \[ \text { (At. nos. : } \mathrm{Ce}=58, ...
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0Which of the following lanthanoid ions is diamagnetic?
\[
\text { (At. nos. : } \mathrm{Ce}=58, \mathrm{Sm}=62, \mathrm{Eu}=63, \mathrm{Yb}=70 \text { ) }
\]
(A) \( \mathrm{Sm}^{2+} \)
(B) \( \mathrm{Eu}^{2+} \)
(C) \( \mathrm{Yb}^{2+} \)
(D) \( \mathrm{Ce}^{2+} \)
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